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2024-01-04 1543e317f1da31b75942316931e8f491a8920811 
 kernel/drivers/gpu/arm/bifrost/mali_kbase_pm.h
....@@ -1,7 +1,7 @@
11 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
22 /*
33  *
4
- * (C) COPYRIGHT 2010-2021 ARM Limited. All rights reserved.
4
+ * (C) COPYRIGHT 2010-2022 ARM Limited. All rights reserved.
55  *
66  * This program is free software and is provided to you under the terms of the
77  * GNU General Public License version 2 as published by the Free Software
....@@ -20,7 +20,7 @@
2020  */
2121 
2222 /**
23
- * Power management API definitions
23
+ * DOC: Power management API definitions
2424  */
2525 
2626 #ifndef _KBASE_PM_H_
....@@ -39,29 +39,32 @@
3939 #define PM_NO_RESET          0x04
4040 #endif
4141 
42
-/** Initialize the power management framework.
42
+/**
43
+ * kbase_pm_init - Initialize the power management framework.
44
+ *
45
+ * @kbdev: The kbase device structure for the device
46
+ *              (must be a valid pointer)
4347  *
4448  * Must be called before any other power management function
4549  *
46
- * @param kbdev The kbase device structure for the device
47
- *              (must be a valid pointer)
48
- *
49
- * @return 0 if the power management framework was successfully initialized.
50
+ * Return: 0 if the power management framework was successfully initialized.
5051  */
5152 int kbase_pm_init(struct kbase_device *kbdev);
5253 
53
-/** Power up GPU after all modules have been initialized and interrupt handlers installed.
54
+/**
55
+ * kbase_pm_powerup - Power up GPU after all modules have been initialized
56
+ *                    and interrupt handlers installed.
5457  *
55
- * @param kbdev     The kbase device structure for the device (must be a valid pointer)
58
+ * @kbdev:     The kbase device structure for the device (must be a valid pointer)
59
+ * @flags:     Flags to pass on to kbase_pm_init_hw
5660  *
57
- * @param flags     Flags to pass on to kbase_pm_init_hw
58
- *
59
- * @return 0 if powerup was successful.
61
+ * Return: 0 if powerup was successful.
6062  */
6163 int kbase_pm_powerup(struct kbase_device *kbdev, unsigned int flags);
6264 
6365 /**
64
- * Halt the power management framework.
66
+ * kbase_pm_halt - Halt the power management framework.
67
+ *
6568  * @kbdev: The kbase device structure for the device (must be a valid pointer)
6669  *
6770  * Should ensure that no new interrupts are generated,
....@@ -71,16 +74,20 @@
7174  */
7275 void kbase_pm_halt(struct kbase_device *kbdev);
7376 
74
-/** Terminate the power management framework.
77
+/**
78
+ * kbase_pm_term - Terminate the power management framework.
79
+ *
80
+ * @kbdev:     The kbase device structure for the device (must be a valid pointer)
7581  *
7682  * No power management functions may be called after this
7783  * (except @ref kbase_pm_init)
78
- *
79
- * @param kbdev     The kbase device structure for the device (must be a valid pointer)
8084  */
8185 void kbase_pm_term(struct kbase_device *kbdev);
8286 
83
-/** Increment the count of active contexts.
87
+/**
88
+ * kbase_pm_context_active - Increment the count of active contexts.
89
+ *
90
+ * @kbdev:     The kbase device structure for the device (must be a valid pointer)
8491  *
8592  * This function should be called when a context is about to submit a job.
8693  * It informs the active power policy that the GPU is going to be in use shortly
....@@ -94,8 +101,6 @@
94101  * @note a Suspend is only visible to Kernel threads; user-space threads in a
95102  * syscall cannot witness a suspend, because they are frozen before the suspend
96103  * begins.
97
- *
98
- * @param kbdev     The kbase device structure for the device (must be a valid pointer)
99104  */
100105 void kbase_pm_context_active(struct kbase_device *kbdev);
101106 
....@@ -123,7 +128,11 @@
123128 #endif /* CONFIG_MALI_ARBITER_SUPPORT */
124129 };
125130 
126
-/** Suspend 'safe' variant of kbase_pm_context_active()
131
+/**
132
+ * kbase_pm_context_active_handle_suspend - Suspend 'safe' variant of kbase_pm_context_active()
133
+ *
134
+ * @kbdev:     The kbase device structure for the device (must be a valid pointer)
135
+ * @suspend_handler: The handler code for how to handle a suspend that might occur
127136  *
128137  * If a suspend is in progress, this allows for various different ways of
129138  * handling the suspend. Refer to @ref enum kbase_pm_suspend_handler for details.
....@@ -133,20 +142,18 @@
133142  * indicates a failure, the caller must abort whatever operation it was
134143  * attempting, and potentially queue it up for after the OS has resumed.
135144  *
136
- * @param kbdev     The kbase device structure for the device (must be a valid pointer)
137
- * @param suspend_handler The handler code for how to handle a suspend that might occur
138
- * @return zero     Indicates success
139
- * @return non-zero Indicates failure due to the system being suspending/suspended.
145
+ * Return: 0 on success, non-zero othrewise.
140146  */
141147 int kbase_pm_context_active_handle_suspend(struct kbase_device *kbdev, enum kbase_pm_suspend_handler suspend_handler);
142148 
143
-/** Decrement the reference count of active contexts.
149
+/**
150
+ * kbase_pm_context_idle - Decrement the reference count of active contexts.
151
+ *
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+ * @kbdev:     The kbase device structure for the device (must be a valid pointer)
144153  *
145154  * This function should be called when a context becomes idle.
146155  * After this call the GPU may be turned off by the power policy so the calling
147156  * code should ensure that it does not access the GPU's registers.
148
- *
149
- * @param kbdev     The kbase device structure for the device (must be a valid pointer)
150157  */
151158 void kbase_pm_context_idle(struct kbase_device *kbdev);
152159 
....@@ -155,8 +162,9 @@
155162  */
156163 
157164 /**
158
- * Suspend the GPU and prevent any further register accesses to it from Kernel
159
- * threads.
165
+ * kbase_pm_suspend - Suspend the GPU and prevent any further register accesses
166
+ *                    to it from Kernel threads.
167
+ *
160168  * @kbdev: The kbase device structure for the device (must be a valid pointer)
161169  *
162170  * This is called in response to an OS suspend event, and calls into the various
....@@ -165,12 +173,15 @@
165173  * @note the mechanisms used here rely on all user-space threads being frozen
166174  * by the OS before we suspend. Otherwise, an IOCTL could occur that powers up
167175  * the GPU e.g. via atom submission.
176
+ *
177
+ * Return: 0 on success.
168178  */
169
-void kbase_pm_suspend(struct kbase_device *kbdev);
179
+int kbase_pm_suspend(struct kbase_device *kbdev);
170180 
171181 /**
172
- * Resume the GPU, allow register accesses to it, and resume running atoms on
173
- * the GPU.
182
+ * kbase_pm_resume - Resume the GPU, allow register accesses to it,
183
+ *                   and resume running atoms on the GPU.
184
+ *
174185  * @kbdev: The kbase device structure for the device (must be a valid pointer)
175186  *
176187  * This is called in response to an OS resume event, and calls into the various
....@@ -207,8 +218,10 @@
207218  * @note the mechanisms used here rely on all user-space threads being frozen
208219  * by the OS before we suspend. Otherwise, an IOCTL could occur that powers up
209220  * the GPU e.g. via atom submission.
221
+ *
222
+ * Return: 0 on success.
210223  */
211
-void kbase_pm_driver_suspend(struct kbase_device *kbdev);
224
+int kbase_pm_driver_suspend(struct kbase_device *kbdev);
212225 
213226 /**
214227  * kbase_pm_driver_resume() - Put GPU and driver in resume